Exam 2 Shoulder muscles Flashcards Preview

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Flashcards in Exam 2 Shoulder muscles Deck (17):
1

Muscles that originate on the vertebral column or skull

1. Trapezius
2. Rhomboid Major
3. Rhomboid Minor
4. Levator Scapula
5. Latissimus Dorsi

2

Origin of the trapezius

- External Occipital Protuberence (EOP)
- Superior Nuchal Line
- Ligamentous nuchae
- Spines of the thoracic vertebrae

3

Insertion of the trapezius

Clavicle
acromion process

4

Actions of the trapezius

1. stabilizes the scapula (holds it in normal anatomical position)
2. Upper portion: elevates the scapula
3. Middle & lower portions: adducts the scapula

5

Nerve supply of the trapezius

- Motor innervation from the spinal accessory nerve (XI cranial)
- Sensory innervation from C4 & C5

6

Origin of the Rhomboid Major

Spine/ upper thoracic vertebrae

7

Insertion of the Rhomboid Major

Vertebral border of the scapula

8

Origin of the Rhomboid Minor

Spines/ Lower thoracic & 1st thoracic vertebrae

9

Insertion of the Rhomboid Minor

Vertebral border/ scapula

10

Origin of the levator scapula

transverse process/ upper cervical vertebrae

11

Insertion of the levator scapula

Superior angle / scapula

12

Actions of Rhomboid Major, minor & levator scapula

1. Elevates the scapula
2. Adducts the scapula
3. stabilizes the scapula

13

Nerve supply of the Rhomboid major, minor & levator scapula

Dorsal scapular nerve (C5)

14

Origins of the latissimus dorsi

- Spines/ lower thoracic & lumbar vertebrae
- thoracodorsal fasica
- Crest of ilium
- Lower ribs

15

Insertion of the latissimus dorsi

Intertubercular groove (lesser tubercle)/ humerus

16

Actions of latimmimus dorsi

1. Extends, adducts & medially rotates the humerus
2. Involved w/ forced expiration

17

Nerve supply of the latissimus dorsi

thoracodaorsal (C6, C7 & C8)